BACKGROUND & AIMS: Reports in the literature regarding the relationship of infection with cagA -positive strains of Helicobacter pylori to gastric cancer over and above H. pylori infection alone are conflicting. The aim of this study was to estimate the magnitude of the risk for gastric cancer associated with cagA seropositivity and to identify any sources of heterogeneity between studies. METHODS: A meta-analysis of case-control studies with age- and sex-matched controls, which provided raw data on the infection rates with H. pylori and cagA strains of H. pylori as detected by serology or polymerase chain reaction DNA, was performed. RESULTS: A comprehensive literature search identified 16 qualified studies with 2284 cases and 2770 controls. H. pylori and cagA seropositivity significantly increased the risk for gastric cancer by 2.28- and 2.87-fold, respectively. Among H. pylori -infected populations, infection with cagA -positive strains further increased the risk for gastric cancer by 1.64-fold (95% confidence interval [CI], 1.21-2.24) overall and by 2.01-fold (95% CI, 1.21-3.32) for noncardiac gastric cancer. Gastric cancer at the cardia is not associated with H. pylori infection or cagA -positive strains of H. pylori. Patient age and site of gastric cancer contributed to the heterogeneity between studies. CONCLUSIONS: Infection with cagA -positive strains of H. pylori increases the risk for gastric cancer over the risk associated with H. pylori infection alone. Searching for cagA status over H. pylori infection may confer additional benefit in identifying populations at greater risk for gastric cancer.
BACKGROUND & AIMS: Reports in the literature regarding the relationship of infection with cagA -positive strains of Helicobacter pylori to gastric cancer over and above H. pyloriinfection alone are conflicting. The aim of this study was to estimate the magnitude of the risk for gastric cancer associated with cagA seropositivity and to identify any sources of heterogeneity between studies. METHODS: A meta-analysis of case-control studies with age- and sex-matched controls, which provided raw data on the infection rates with H. pylori and cagA strains of H. pylori as detected by serology or polymerase chain reaction DNA, was performed. RESULTS: A comprehensive literature search identified 16 qualified studies with 2284 cases and 2770 controls. H. pylori and cagA seropositivity significantly increased the risk for gastric cancer by 2.28- and 2.87-fold, respectively. Among H. pylori -infected populations, infection with cagA -positive strains further increased the risk for gastric cancer by 1.64-fold (95% confidence interval [CI], 1.21-2.24) overall and by 2.01-fold (95% CI, 1.21-3.32) for noncardiac gastric cancer. Gastric cancer at the cardia is not associated with H. pyloriinfection or cagA -positive strains of H. pylori. Patient age and site of gastric cancer contributed to the heterogeneity between studies. CONCLUSIONS:Infection with cagA -positive strains of H. pylori increases the risk for gastric cancer over the risk associated with H. pyloriinfection alone. Searching for cagA status over H. pyloriinfection may confer additional benefit in identifying populations at greater risk for gastric cancer.
Authors: Robert W Haile; Esther M John; A Joan Levine; Victoria K Cortessis; Jennifer B Unger; Melissa Gonzales; Elad Ziv; Patricia Thompson; Donna Spruijt-Metz; Katherine L Tucker; Jonine L Bernstein; Thomas E Rohan; Gloria Y F Ho; Melissa L Bondy; Maria Elena Martinez; Linda Cook; Mariana C Stern; Marcia Cruz Correa; Jonelle Wright; Seth J Schwartz; Lourdes Baezconde-Garbanati; Victoria Blinder; Patricia Miranda; Richard Hayes; George Friedman-Jiménez; Kristine R Monroe; Christopher A Haiman; Brian E Henderson; Duncan C Thomas; Paolo Boffetta Journal: Cancer Prev Res (Phila) Date: 2012-02
Authors: Barbara G Schneider; Dun-Fa Peng; M Constanza Camargo; M Blanca Piazuelo; Liviu A Sicinschi; Robertino Mera; Judith Romero-Gallo; Alberto G Delgado; Luis E Bravo; Keith T Wilson; Richard M Peek; Pelayo Correa; Wael El-Rifai Journal: Int J Cancer Date: 2010-12-01 Impact factor: 7.396
Authors: Giorgio Palestro; Rinaldo Pellicano; Gian Ruggero Fronda; Guido Valente; Marco De Giuli; Tito Soldati; Agostino Pugliese; Stefano Taraglio; Mauro Garino; Donata Campra; Miguel Angel Cutufia; Elena Margaria; Giancarlo Spinzi; Aldo Ferrara; Giorgio Marenco; Mario Rizzetto; Antonio Ponzetto Journal: World J Gastroenterol Date: 2005-12-07 Impact factor: 5.742